The Perimeter of a Field

Find a completely simplified expression for the perimeter (2⋅\displaystyle \cdotlength + 2⋅\displaystyle \cdotwidth) of the blue rectangle:



   

6x+2\displaystyle {6}{x}+{2}

   
 

2x−9\displaystyle {2}{x}-{9}

 
Perimeter =  

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